digisetup.osx

It's just a preference file - just delete that file, then make sure you re-set any personal preferences next time you launch PT. Then, if you've installed any of the norton disk utilities, immediately uninstall them - they're no good and will mess up your system something fierce. The anti-virus is not as evil, but disable any auto-scanning or running-in-the background stuff. BTW, there are almost zero viruses for the mac, so it's really not necessary to have an anti-virus program anyway. I would only install and run it if you really think you've been infected by something. In my 5 years of supporting, upgrading and repairing macs (including working at an apple store), I've only seen one person get a virus, and it was only a MS Word macro-virus that didn't really do any harm at all, and that person got it because they broke the #1 rule and opened an email attachment from someone they didn't know. Your mac is safe from viruses, believe me.

The guys at mac gurus recommend you get rid of NAV,lots of problems reported with OS10.3 Ray

My NAV runs fine, just the Privacy Controls are screwed up. I've found this Digisetup.osx.corrupt file too, and have deleted it with no problems.

Where do I find it, to delete it?

Home/ Library/ Preferences